Protection means for water wall furnaces



July 22, 1941. R. BEERS PROTECTION MEANS FOR WATER WALL FURNACES,-

Filed Aug. 12, 1940 INVENTOR. ROYCE L.BEERS F IG.5.

ATTORNEYS Patented July 22, 1941 PROTECTION MEANS FOR WATER WALL FURNACES Royce L. Beers, Birmingham, Mich., assignor to Detroit Stoker Company, Monroe, Mich., a corporation of Michigan Application August 12, 1940, Serial No. 352,317

3 Claims.

The invention relates to furnaces of that type in which the combustion chamber is lined by a water wall. Usually such water walls are formed of a series of vertically extending tubes connected at their lower ends with a common hori-' zontally extending header and with certain constructions, this header is arranged below the level of the grate. However, it is sometimes desirable to place the header above the grate level particularly where certain types of stoker are used. For instance, with one type of stoker, the fuel is fed from the center of the combustion chamber towards one side thereof and with continuous ash discharge means adjacent to said side. With such construction, the header may be conveniently located adjacent to the ash discharge means, but must be protected from injury by abrasion.

It is the object of the invention to obtain a consruction of header protecting means which may be easily applied and which will effectively prevent abrasion. To this end, the invention consists in the construction as hereinafter set forth.

In the drawing:

Figure 1 is a cross section through a portion of a water wall furnace to which my improvements are applied;

Figure 2 is a side elevation of a portion of the header with the protecting means mounted thereon;

Figure 3 is a sectional plan view of Figure 2;

Figure 4 is a cross section on line l4v of Figure 2;

Figure 5 is a horizontal section on line 55 of Figure 4.

As illustrated, A is a side wall of the furnace with the water wall B adjacent thereto. This water wall is formed of a series of spaced vertically extending tubes which at their upper ends are connected with the boiler (not shown) and at their lower ends are connected to a horizontally extending header C. D is a stoker including grate bars E which are inclined downwardly from the center of the furnace chamber towards the side wall thereof. F is the ash discharge means connected with the lower ends of the grate bars E and which, as shown, is of arcuate form arranged adjacent to the header C.

With this construction as thus far described, the continuous discharge of ash by the means F would produce an abrasive effect on the header C and possibly also on the lower portions of the tubes B. Therefore, I have designed protecting means for these parts constructed as follows.

G are protection blocks, preferably formed of cast metal and of a width substantially corresponding to the space between centers of the tubes B. These blocks are of segmental form to fit over the header C and to extend downwardly below the ash discharge means F. At their upper ends, the blocks are notched on their opposite sides to fit about adjacent tubes B; the outer end portions G being of greater width than the space between said tubes to interlock therewith. Thus, by first inclining the blocks in relation to the tubes, the portions G may be inserted between said tubes and will interlock therewith when the block is lowered into contact with the header. The lower ends of the blocks are also attached to the header, preferably by a longitudinally extending bar H which is detachably secured to the header. As shown, this detachable engagement is formed by a series of nuts or internally threaded bosses I welded to the header to cooperate with a series of clamping bolts J.

If desired, the lower portions of the tubes C may also be protected from abrasion by a series of blocks K. These are fashioned to fit about the tubes and may be successively engaged therewith by a slight rotary movement.

The protecting means, above described, can be manufactured at a low cost and can be quickly applied for the protection of the header and the tubes. Also, if necessary, the blocks may be easily replaced in case of injury thereto.

What I claim as my invention is:

1. In a furnace, the combination with a water wall comprising a series of tubes and a header to which the lower ends of said tubes are connected, of protecting means comprising a series of segmental blocks successively engageable with said header to cover a segment thereof, said blocks extending between adjacent tubes to form an interlocking engagement therewith, and means engaging the lower ends of said blocks to secure the same to said header.

2. In a furnace, the combination with a water wall comprising a series of tubes and a header to which the lower ends of said tubes are connected, of protecting means comprising'a series of segmental blocks successively engageable with said header to cover a segment thereof, said blocks extending between adjacent tubes to form aninterlocking engagement therewith, and a bar extending longitudinally of said header and detachably secured thereto for engaging the lower ends of said blocks to hold the same in position.

3. In a furnace, the combination with a water well comprising a series of tubes and a header to which the lower ends of said tubes are connected, of protecting means secured to said header to cover a segment thereof, said means comprising a series of segmental blocks for fitting about said header and of a width substantially corresponding to the spacing between centers of adjacent tubes, said blocks being notched to fit about said tubes and being engageable therewith when inclined with respect to the axis of the header, and a bar detachably secured to and extending longitudinally of said header to over- 5 lap the lower ends of said blocks.

ROYCE L. BEERS. 

